Assessment of a Numerical Homogenization Approach for the Vibroacoustics of Elastic Classical Multilayered and Complex Structures
摘要
This work presents and assesses the use of an equivalent single layer plate as an isotropic and orthotropic carrier in the context of a wave-based and a forced-based homogenization approaches. The wave-based approach conserves the three main propagating waves of the reference structure. The forced-based strategy uses a multi-objective Pareto-search-based numerical dynamic homogenization approach to conserve the input power and Transmission Loss (TL) of the reference structure. Both approaches are applied to a multilayered and a soft-core sandwich panels (classical structures) as well as to an orthogonal bi-ribbed panel (complex periodic structure). Four forced response indicators (input power, total energy, radiated power and oblique incidence/diffuse TL) are systematically computed and compared with their references within the audible frequency range. These comparisons demonstrate the effectiveness of the forced-based orthotropic carrier strategy, to correctly capture typical vibroacoustic behavior of elastic classical and complex periodic structures. Low damped complex periodic structures with stop bands present a challenge for an equivalent single layer plate carrier in a context of a forced-based strategy. An improvement in the forced response performance of the isotropic carrier is obtained when the forced-based strategy is compared with the wave-based strategy.